Optical instrument.



F. L. G. KOLLMGRGEN.

OPTIGAL IN STRUMBNT.

APPLIoATIoN H Lnn JUNE z5, 190e.

Patented Nov. 23, 1909.

JA l

UNITED STATE PATENT OFFICE.

FREDERICK L. Gr. KOLLMORGEN, OF IVIONTCLAIR, NEW JERSEY, ASSIGNOR TOKEUFFEL 8a ESSER COIYIPANY, OF HOBOKEN, NEXV JERSEY, A CORPORATION OFNEW JERSEY.

OPTICAL INSTRUMENT.

To all whom it may concern:

Be it known that I, FREDERICK L. Gr. KoLLMoRGuN, a citizen of the GermanEmpire, and resident of Montclair, Essex county, New Jersey, haveinvented certain new and useful Improvement-s in Optical Instruments, ofwhich the following is a specification. i

My invent-ion relates to telescopes and particularly to that class ofinstruments in l which Porro prisms are used to shorten the i distancebetween the eye piece and the objective.

In the drawings, Figure l is a top plan View of a portion of a telescopeembodying my invention, the concealed parts being shown in dottedoutline; Fig. 2 is a transverse section on the plane of the line 2-2- inFig. l and Fig. 3 is a side elevation of the parts looking from theright toward the left in Fig. l and showing the prisms out of thetelescope and in a position to be cleaned, adjusted or otherwisemanipulated.

It is eminently desirable that in an instrument of this character all ofthe parts should be accessible in order that they may readily be cleanedand adjusted. It is also desirable that if they are removed from theirposition in the telescope they should be restored eX- actly in theirformer position with respect to the other parts of the instrument, andit is also desirable that access should be anorded to the surfacesopposite the space between the prisms as well as to their othersurfaces. So far as known to me the art does not disclose an instrumentpossessing all of these advantages and it is my purpose to supply suchan expressed need.

In the drawings, l represents one portion of a telescope; is a secondportion and 3 is the prism container between them. The telescope, itwill be assumed, is supplied with the usual optical elements, offset inthe usual manner through which the rays of light pass and the prisms arearranged in the usual manner, so as to achieve the erection of theimage.

The container 3 has two end walls, one t to receive the tube l and theother 5 to receive the tube 2, these walls are roughly triangular inshape and they are connected by a continuous bottom wall 6.

Two frames or brackets 7 and 8 are sel i l i l Specification of LettersPatent.

Application filed June 25, 1908.

cured to wings or supports 7 a, 8a which are Patented Nov. 23, 1909.

Serial No. 440,224.

hinged to the upper edge ci' the bottom wall 6, on one ot' theseadjacent to the tube 2 is mounted the prism member 9 and on the otheradjacent to the tube l is mounted the prism member IO. These prismmembers are each firmly secured in place in the usual manner. Eachsupport 7', Sa serves to close a container and it is held in position byscrews l2, so as securely to close it against dust. The brackets 7 and 8are held togetherl by any suitable means, as screws 17 and screw holes15.

I/V hen it is desired to use the device, the lid is uni'astened and bothof the frames 7 and 8 are swung on their hinges to bring them togetherout of the container butwithout detaching them from it. The parts arethen readily accessible including the two opposed surfaces of theprisms, when the frames are separated from each other. They may beadjusted or cleaned, but if the adjustment is not touched it is obviousthat when returned within the container the parts will register withtheir proper cooperating parts as before.

Secured to or made integral with the bracket 7 are two externallyprojecting plates 70 and 7l between which is secured the prism 9 bymeans of an intermediate transverse plate 7 2 secured to the plates 70and 7l by means of screws 73, or in any other suitable manner. Adjustingscrews 7 5 7 5 are adapted to be passed through the plates 70 and 7l andimpinge against the sides of the prism to secure its proper adjustment.In a similar manner two plates SO and 8l with an intermediate plate S2are secured to the bracket 8 and serve to hold the prism l0, andadjusting screws precisely similar to the screws 75 and 7ozL serve to eifeet the adjustment of that prism.

This construction makes it possible to mount the prisms close to eachother and yet to have their opposed surfaces quite accessible. In allother forms of such instruments known to me accessibility is onlysecured by leaving a relatively great distance between the prisms andthis necessitates the use of an unnecessarily large prism which I avoid.In my device both prisms may be small and of equal size. N ot only arethe prisms accessible but by coupling the brackets together I securegreater strength while they are being moved and yet can sepa "ate themafter they are moved. The method of securing the prisms also permits ofcomplete accessibility of the adjusting means.

What I claim as new is l. An optical instrument comprising a tubularbody, an olfset prism container open on one side and two hinged supportseach adapted to carry prism elements.

2. An optical instrument comprising a tubular body, an offset prismcontainer open on one side and provided with a plurality of separatelyhinged supports forming inclosures each adapted to carry prism elements,whereby each of such prism elements may be swung out from and returnedto the instrument without disturbing their relative position withrespect to the other parts of the device.

3. An optical instrument comprising a tubular body, an offset prismcontainer open on' one side and two hinged supports each adapted tocarry prism elements in combination with means whereby the supports maybe detachably secured to the container.

4:. An optical instrument comprising a tubular body, an offset prismcontainer open on one side and two hinged supports secured thereto, eachadapted to carry prism elements, and each movable on their hingesrelatively to each other to afford access to the `opposed surfaces ofthe prisms.

5. An optical instrument comprising a tubular body, an offset prismcontainer open on one side and two hinged supports secured thereto, eachadapted to carry prism elements of identical size and each movable ontheir hinges relatively to each other to afford access to the opposedsurfaces of the prisms.

6. An optical instrument comprising a tubular body, an offset prismcontainer open on one side and two hinged supports each adapted to carryprism elements and arranged to be swung separately or together.

7. A prism bracket comprising two eXternally projecting plates adaptedto engage the prism, an intermediate plate secured to both projectingplates and adjusting screws passing through the projecting plates tocontact with the prism so that it may be adjusted relative to theplates.

/Vitness my hand this 20th day of June 1908, at New York, N. Y.

FREDERICK L. G. KOLLMORGEN.

Witnesses HERMAN MEYER, ALAN C. MCDONNELL.

